riscv/rocket-chip
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fix NASTI -> HASTI bridge

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This commit is contained in:
Howard Mao 2016-05-31 19:47:50 -07:00
parent 56897f707a
commit d0988902f2
1 changed files with 13 additions and 9 deletions
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22
junctions/src/main/scala/hasti.scala
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@ -370,6 +370,8 @@ class HastiMasterIONastiIOConverter(implicit p: Parameters) extends HastiModule(
require(hastiAddrBits == nastiXAddrBits)
require(hastiDataBits == nastiXDataBits)
val r_queue = Module(new Queue(new NastiReadDataChannel, 2))
val s_idle :: s_read :: s_write :: s_write_resp :: Nil = Enum(Bits(), 4)
val state = Reg(init = s_idle)
@ -379,19 +381,26 @@ class HastiMasterIONastiIOConverter(implicit p: Parameters) extends HastiModule(
val len = Reg(UInt(width = nastiXLenBits))
val data = Reg(UInt(width = nastiXDataBits))
val first = Reg(init = Bool(false))
val rvalid = Reg(init = Bool(false))
val is_rtrans = (state === s_read) &&
(io.hasti.htrans === HTRANS_SEQ ||
io.hasti.htrans === HTRANS_NONSEQ)
val rvalid = Reg(next = is_rtrans)
io.nasti.aw.ready := (state === s_idle)
io.nasti.ar.ready := (state === s_idle) && !io.nasti.aw.valid
io.nasti.w.ready := (state === s_write) && io.hasti.hready
io.nasti.b.valid := (state === s_write_resp)
io.nasti.b.bits := NastiWriteResponseChannel(id = id)
io.nasti.r.valid := (state === s_read) && io.hasti.hready && !first
io.nasti.r.bits := NastiReadDataChannel(
io.nasti.r <> r_queue.io.deq
r_queue.io.enq.valid := io.hasti.hready && rvalid
r_queue.io.enq.bits := NastiReadDataChannel(
id = id,
data = io.hasti.hrdata,
last = (len === UInt(0)))
assert(!r_queue.io.enq.valid || r_queue.io.enq.ready,
"HASTI -> NASTI converter queue overflow")
io.hasti.haddr := addr
io.hasti.hsize := size
@ -406,7 +415,6 @@ class HastiMasterIONastiIOConverter(implicit p: Parameters) extends HastiModule(
Mux(first, HTRANS_IDLE, HTRANS_BUSY)),
s_read -> MuxCase(HTRANS_BUSY, Seq(
first -> HTRANS_NONSEQ,
(len === UInt(0)) -> HTRANS_IDLE,
io.nasti.r.ready -> HTRANS_SEQ))))
when (io.nasti.aw.fire()) {
@ -435,13 +443,9 @@ class HastiMasterIONastiIOConverter(implicit p: Parameters) extends HastiModule(
when (io.nasti.b.fire()) { state := s_idle }
when (state === s_read && first) {
when (is_rtrans) {
first := Bool(false)
addr := addr + (UInt(1) << size)
}
when (io.nasti.r.fire()) {
addr := addr + (UInt(1) << size)
len := len - UInt(1)
when (len === UInt(0)) { state := s_idle }
}